<template>
  <view>
    <view class="search-box">
      <uni-search-bar @input="input" :radius="100" cancelButton="none" v-model="kw"></uni-search-bar>
    </view>
    <!-- 搜索建议列表 -->
    <view class="sugg-list" v-if="searchResults.length !== 0">
      <view class="sugg-item" v-for="(item,i) in searchResults.goods" :key="i"  @click="gotoDetail(item)">
        <view class="goods-name">{{item.goods_name}}</view>
        <uni-icons type="arrowright" size="16"></uni-icons>
      </view>
    </view>
    
    <!-- 搜索历史 -->
    <view class="history-box" v-else>
      <!-- 标题区 -->
      <view class="history-title">
        <text>搜索历史</text>
        <uni-icons type="trash" size="17" @click="clean"></uni-icons>
      </view>
      <!-- 列表区 -->
      <view class="history-list">
        <uni-tag :text="item" v-for="(item,i) in histories" :key="i" @click="gotoGoodsList(item)"></uni-tag>
      </view>
    </view>
  </view>
</template>

<script>
  export default {
    data() {
      return {
        timer: null,
        kw: '',
        //搜索结果列表
        searchResults: [],
        historyList:[],
      };
    },
    onLoad() {
      this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]')
    },
    methods: {
      // input 输入事件
      input(e) {
        clearTimeout(this.timer)
        this.timer = setTimeout(() => {
          this.getSearchList()
        }, 500)
      },
      
      async getSearchList() {
        if (this.kw.length === 0) {
          this.searchResults = []
          return
        }
        const {
          data: res
        } = await uni.$http.get('/api/public/v1/goods/search', {
          query: this.kw
        })
        if (res.meta.status !== 200) return uni.$showMsg()
        this.searchResults = res.message
        this.saveSearchHistory()
      },
      // 跳转详细页面
      gotoDetail(item) {
        uni.navigateTo({
          url: '/subpkg/goods_detail/goods_detail?goods_id=' + item.goods_id
        })
      },
      // 保存搜索历史
      saveSearchHistory(){
         // this.historyList.push(this.kw)
        
          // 1. 将 Array 数组转化为 Set 对象
          const set = new Set(this.historyList)
          // 2. 调用 Set 对象的 delete 方法，移除对应的元素
          set.delete(this.kw)
          // 3. 调用 Set 对象的 add 方法，向 Set 中添加元素
          set.add(this.kw)
          // 4. 将 Set 对象转化为 Array 数组
          this.historyList = Array.from(set)
          
          // 对搜索历史数据 进行持久化存储
          uni.setStorageSync('kw',JSON.stringify(this.historyList))
      },
      // 清除历史记录
      clean() {
        this.historyList = []
        uni.setStorageSync('kw','[]')
      },
      
      // 搜索历史跳转商品列表页面
      gotoGoodsList(item) {
        uni.navigateTo({
            url: '/subpkg/goods_list/goods_list?query=' + item
          })
      }
    },
    computed: {
      histories (){
        return [...this.historyList].reverse()
      }
    }
  }
</script>

<style lang="scss">
  .search-box {
    position: sticky;
    top: 0;
    z-index: 999;
  }
  .sugg-list {
    padding: 0 5px;
  
    .sugg-item {
      font-size: 12px;
      padding: 13px 0;
      border-bottom: 1px solid #efefef;
      display: flex;
      align-items: center;
      justify-content: space-between;
  
      .goods-name {
        // 文字不允许换行（单行文本）
        white-space: nowrap;
        // 溢出部分隐藏
        overflow: hidden;
        // 文本溢出后，使用 ... 代替
        text-overflow: ellipsis;
        margin-right: 3px;
      }
      
    }
  }

.history-box {
  padding: 0 5px;
  .history-title {
    display: flex;
    justify-content: space-between;
    height: 40px;
    align-items: center;
    font-size: 13px;
    border-bottom: #efefef;
  }
  .history-list {
    display: flex;
    flex-wrap: wrap;
    .uni-tag {
      background-color: #C0C0C0;
      margin-top: 5px;
      margin-right: 5px;
    }
  }
}
</style>
